Open AccessSurface grain coarsening and surface softening during machining of ultra-fine grained titanium
Author(s) -
Anastasiia Symonova,
Olga Verezub,
Anna Sycheva,
N.V. Verezub,
Valerii Havin,
George Kaptay
Publication year - 2012
Publication title -
journal of mining and metallurgy. section b, metallurgy/journal of mining and metallurgy. section b, metallurgy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.42
H-Index - 20
eISSN - 2217-7175
pISSN - 1450-5339
DOI - 10.2298/jmmb121109056s
Subject(s) - softening , machining , materials science , surface integrity , indentation hardness , surface (topology) , titanium , metallurgy , grain size , diagram , composite material , microstructure , geometry , mathematics , statistics
Experiments are run to show that different machining conditions applied to ultra-fine grained pure titanium lead to different levels of grain coarsening and softening near the machined surface. Under “hard” machining conditions the upper 40 microns of the machined surface are altered with a decreased microhardness. The experimental results are reasonably reproduced by model calculations. Expanding the parameter field of the model calculations, the surface coarsening diagram and the surface softening diagram due to machining are presented, showing the region of technological parameters, under which neither grain coarsening nor softening takes place along the machined surface